Where does “Eleutherius” come from?

Eleutherius (Latin) comes from Ancient Greek Ἐλευθέριος, from Ancient Greek ἐλεύθερος, from Proto-Hellenic *eléutʰeros.

Ancestry of “Eleutherius”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ἐλευθέριος	—
2	Ancient Greek	ἐλεύθερος	free; freedom; fit for a freeman
3	Proto-Hellenic	*eléutʰeros	—

Eleutherius — Etymology, Origin & Word History | Etymology Explorer